Valve



(No Model.)

B. P. WILLIAMS.

VALVE.

No. 350,650. Patented Oct. 12, 1886.

lei/yin FMG'IZI'Q, n1 6 UNITED STATES PATENT i FFICE.a

VALVE.

SPECIFICATION forming part of Letters Patent No. 350,650, dated October12, 1866.

Application filed December 17, 1885. Serial No. 186,005. No model.)

To all whom it may concern.-

Be it known that I, EDWIN F. WILLIAMs, a citizen of the United States,residing at- Ohicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvementin Val ves, which is fullyset forth in the following specification, reference being had to theaccompanying drawings, in which- Figure 1 is a central longitudinalsectional view through the main and cutoff valves and their seat; Fig.2, a front end elevation, a portion of the main valve and its seat beingbroken away to show the construction; Fig. 3, a longitudinal plansection taken on the line :0 :r, Fig. 1, and Fig. 4 a transversesectional view taken on the line 3 y of Fig. '1..

Like letters refer to like parts in all the fig ures of the drawings.

Myinvention relates to valves for steam-en gines, and more particularlyto that class known as balanced valves, provided with cut-off valves,its object being to provide a valve especially adapted for use inconjunction with high-speed engines, wherein the steam may have a freeand unobstructed passage through the valve to the cylinder, while at thesame time the cut-off valve shall be arranged so as to act with themaximum efficiency.

I will now proceed to describe a construction in which I havepractically carried. out my invent-ion in one form, and will then pointout particularly in the claims those features which I deem to be new anddesire to protect by Letters Patent.

In the drawings, A represents the valveseat, provided, as usual, withthe steam-chair nelsa, leading to the cylinderends, and with theexhaust-passage a, arranged centrally between the two. Supporting-piecesA arise from each side of the seat, and have arranged upon them, in anyapproved manner,thc pressure-plate B, This pressure-plate is provided onits under side,near each end,with channelsb,corresponding to thechannels a of the seat A,and with a central channel, Z), correspondingwith the exhaust-passage A.

0 represents the main valve, which is supported and guided by the valveseat and sup port A in an obvious manner. This valve is provlded at eachend with duplicate ports 0 and 0, extending from top to bottoniof thevalve, the former being open at the end, in order to connect it with theinterior of the steamchcst. In addition to these duplicate ports at eachend the valve is provided with a central exhaust passage or port, 0,extending from top to bottom.

D indicates the cutoff valve, which is arranged within and inclosed bythe main valve. In the present instance this valve is shown asconsisting of a rectangular frame,composed of two cross-bars, (l, ofsufficient size to close the ports a in the main valve when in properposition, these cross-bars being arranged in recesses D in themainvalve, as clearly shown in Fig. 1 of the drawings. These cross-barsd are connected by side bars, (2, and also by means of the cut-oii'valve-rod D, which passes through the hollow main valve-rod O, as shownin Fig. 11. lVhen this form of cutoff valve, constructed in a singlepiece, is employed, the main valve is constructed in two parts, dividedhorizontally at or near its center, in order to enable the cutoff valveto be placed in position within it, the two parts being secured by bolts0.

The operation of Iny improved valve is as follows: lVhen the valve is inthe position shown in the several figures of the drawings,

the steam entering the space D through the open front end of themain'valve will travel in the direction of the arrows, as shown in theseveral figures. A portion of the steam will pass down through theforward port, 0, into the steam-channel a, direct communication be tweenthe two being established through the lower opening of the said port 0.The steam will also pass through the upper opening of the port 0 intothe channel I) in the pressure plate, and through this channel itwillpass into the port 0, and down through the said portinto thesteam-channel (I, as indicatedby the arrows iI1.Fig. 1. It will beobserved that the steam thus has a double passage through the valve intothe steam-channel both from above and below, thus admitting a largeramount ofsteam than would be possible ifa single port were only used. Atthe same time the exhaust steam passes up through the rear channel, a,into the space 0* in the valve, and thence out at the exhaustpassage a,as indicated by the arrows in Figs. 1 and 4. In addi'tion to this directpassage of the exhaust- ICC steam it also, at the beginning of thestroke,

passes up through the rear port, 0, into the rear channel, I), in thepressure -plate, and thence through the passage 0 into theexhaustpassage a, thus providing a double passage through the valve forthe exhaust also. The cutoff valve will operate to close the ports ofthe main valve, through which steam is admitted to the cylinder, in anobvious manner,

it being operated by the usual cut-oft eccentrio to stop the flow ofsteam atthe proper moment by moving in such a manner as tocause one ofthe cross-bars d to close the port a, through which steam is passing atthe time.

It will be seen that while double passages are left at each end of thevalve to admit and exhaust the'steam, the arrangement is neverthelesscompact and simple, the cut-off valve being so located as to take up butlittle space, and, in fact, no additional space.

It is obvious that various mechanical modifications in the details ofconstruction may be made without departing from the principle of myinvention. For instance, although I have shown the main valve asconstructed in two parts to receive the cut-off valve, which latter isconstructed in a single piece, it is obvious that this arrangement maybG'l'GVBlSGd i. e., the main valve may be made in asingle piece, whilethe cut-off valve is so constructed that the cross-bars d areindependent, and may he slipped into placeand subsequently connect ed bythrough-bolts.

. Various other modifications may be employed, and I therefore do notwish to be understood 'as limiting myself strictly to the precisedetails of construction hereinbefore described, and shown in thedrawings.

Having thus described myinvention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a slide-valve for steam-engines, the combination, with thevalve-seat and its steam and exhaust channels, of the pressure-plateprovided with corresponding channels, the main valve provided withduplicate ports at each end, andthe cut off valve arranged within themain valve, substantially as and for the purposes specified.

2. The combination, with the valve-seat and pressure'plate provided withsteam-channels, as described, of the main valve provided with ports 0and c at each end, and the cut off valve D, arranged within the mainvalve and adapted to close the portsc alternately, substantial] y as andfor the purposes specified.

3. The combination, with the valve-seat A,

provided with steam-channels a and exhaustpassage a, of thepressure-plate provided with channels I) and b, the main valve providedat each end with ports 0 and c, and central passage, c", and the cut-offvalve D, arranged within the spaces D in the main valve, substantiallyas and for the purposes specified. EDYVIN F. \VILLIAMS. Witnesses:

IRVINE MILLER, ADELLE L. PHAR

